Sash-balance



(No Model.) 7

H. W. MORGAN.

SASH BALANCE.

No 395,165. I Patented Dec. 25, 1888.

- PEYERS, "lam-Lithographer. Waahmgion, o1:

NITED STATES PATENT OFFICE.

HARRY \V. MORGAN, OF ROCHESTER, NEW YORK.

SASH-BALANCE.

SPECIFICATION forming part of Letters Patent No. 395,165, dated December25, 1888.

Application filed October 2'7, 1888. fierial No. 239,310. (No model.)

To aZZ whom, it may concern:

Be it known that I, HARRY \V. MORGAN, of the city of Rochester, in thecounty of Monroe and State of New York, have invented new and usefulImprovements in Sash-Balances, of which the following is aspecification.

This invention relates to that class of sashbalances which consist of aspring pulley or drum upon which the sash cord or cable is wound, an dwhich are provided with a tension device for retarding the movement ofthe sash-pulley, so as to render the balance less sensitive and enablethe same to be used for supporting sashes of greater or less weightwithout requiring a correspondingchange in the tension of thecounterbalancing-spring.

The object of my invention is to provide the balance with a simple andefficient tension device of this character.

My invention consists of the improvements which will be hereinafterfully described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a sectional side elevation ofmy improved sashbalance applied to a window-sash. Fig. 2 is a rearelevation thereof. Fig. 3 is a crosssection in line a, 1, with thetensionroller in elevation. Fig. 4 is a fragmentary side elevation ofthe pulley and easing, showing the inclined ways onwhich the axle of thetension-roller rests.

Like letters of reference refer to like parts in the several figures.

A represents the face-plate of the casing of the sash-balance, and A Aare the parallel wings or side plates thereof.

B is the pulley or drum upon which the sash-cord b is wound, and c is.the stationary axle upon which the pulley B is loosely mounted. Thepulley H is provided with the usual marginal. flanges, 11, for retainingthe sash-cord upon the pulley. The ends of the axle c are angular orflat-sided, and are arranged in horizontal slots 0, formed in the sideplates, A A, in a well-known manner.

D is the coiled counterbalancing-spring arranged within the pulley B andsecured at one end to the inner side of the pulley and at its other endto the stationary axle c in the customary manner. The sash-cord b isattached at one end to the periphery of the pulley B and at itsoppositeend to the sash.

F represents a tension-roller bearing against the faces of thepulley-flanges b at the lower rear portion of the pulley B, whereby therotation of the pulley is retarded. Thetensionroller F is mounted uponan axle, f, which rests loosely on inclined ways formed at the lowerrear portions of the side plates, A.

h is a guide-roller journaled in the front portion of the casing, infront of the tensionroller F. The sash-cord 1) passes from the lowerside of the pulley B around the rear side of the tension-roller F, andthen forwardly over the guide-roller h, the cord being wound upon thepulley in a direction opposite to that in which it passes around thetension-roller F, so that the pulley and tension-roller will be turnedin opposite directions.

The inclined ways g trend toward the center of the pulley B, as shown inFigs. 1 and 4, so that the strain 011 the sash-cord will draw thetension-roller against the faces of the pulley flanges b. Thetension-roller is in this manner pressed against the faces of the pulleywith greater or. less force according to the weight of the sash, therebyretarding the movement of the pulley and preventing too easy relaxationof the tension spring D. Should the sash be somewhat light for thetension of the spring, the pressure of the tension-roller against thepulley B will be sufficient to balance the sash and prevent the springfrom violently raising the sash when the latter is released; and in casethe weight of the window should be somewhat greater than the tension ofthe spring, the tensionroller will be more firmly pressed against thepulley and thereby increase the resistance of the sash-balancesufficiently to properly balance the sash. The resistance of thesashbalance by the aid of the tension-roller is in this mannerautomatically regulated and accommodated to any slight variation in theweight of the suspended sash without requiring a change in the tensionof the counterbalancing-spring, thus enabling the same sash-balance tobe used for holding sashes of different weight. lVhen the sash is raisedor lowered, the tension-r0ller revolves freely in contact with thesash-pulley and permits the sash to be moved with little effort.

The tension-roller is mounted loosely upon its axle, so that the rollermay turn freely in ways is avoided.

contact With the peripheral faces of the pulley B and so that the aXleofthe roller may rotate independently of the pulley on its ways toward andfrom the pulley. By this construction excessive friction of the axle onits The end portions of this axle are preferably reduced in diameter toform shoulders, which bear against the inner sides of the side plates,A, of the casing, as shown in Fig. 3, and whereby the axle is heldagainst lateral displacement.

I claim as my invention- 1. The combination, with the sash-pulley andits spring, of a tension-roller bearing against the face of thesash-pulley, substantially as set forth.

2. The combination, with the pulley-casing having ways, of thesash-pulley mounted in said casing and provided with acounterbalancing-spring, and a tension-roller bearing against the faceof said pulley resting on said ways and capable of moving toward andfrom the face of the pulley, substantially as set forth.

3. The combination, with the pulley-casing having ways, of thesash-pulley mounted in said casing and provided with a counterbalanoing-sprin g, a tension-roller bearing against the face of said pulley,resting on said ways and capable of moving toward and from the face ofthe pulley, a guide-roller arranged at the front portion of said casing,and a sash cord or cable running around-said tensionroller and over saidguide-roller, substantially as set forth.

4. The combination, with the pulley and its counterbalancing-spring, ofthe pulley-casing provided with ways trending toward the cen-' ter ofthe pulley, a tension-roller bearing against the face of the pulley, andan axle upon which the tension-roller is mounted, which is capable ofrotat-ive movement independent of the tension-roller and which restsloosely on the ways of the pulley-casing, substantially as set forth.

Vitness my hand this 18th day of October, 1888.

HARRY XV. MORGAN.

\Vitnesses:

LEWIS F. LUX, O. O. DAVY.

